4.4 Chemical Reactions, Overexposure & Burns

The NIC Scientific Concepts outline groups chemical reactions, overexposure, and chemical burn in the same breath because the salon does not separate them on a busy Saturday. A hydroxide relaxer that is doing its job is already a violent chemical reaction on keratin. Leave it past the strand-test window and you have a burn. Breathe monomer fumes every shift with poor ventilation and you have overexposure even if no single splash occurred. Your job is to name the event correctly so you pick the correct response.

Reactions you are paid to control

A physical change rearranges form: melting wax, a suspension settling, water evaporating from a wet sanitizer (which is why the pan goes weak and must be changed). A chemical change builds or breaks bonds:

• Reduction (thio waves and thio relaxers): the reducing agent donates hydrogen and breaks disulfide bonds so hair can be reshaped.
• Oxidation (neutralizers, developers, lighteners): oxygen from peroxide (or another labeled oxidizer) rebuilds disulfide bonds or oxidizes melanin and dye intermediates.
• Lanthionization (hydroxide relaxers): disulfide bonds are converted to lanthionine; the hair is permanently altered, not waiting for a thio-style rebuild.
• Exothermic reactions release heat. Some relaxers and rapid-oxidation mixes become noticeably warm. Heat is energy leaving the reaction; on a scalp it is also a stop-and-check signal, not proof that “it’s working extra well.”

If you cannot describe what the product is doing to bonds or melanin, you are not ready to leave it on a client while you take another color application at the next chair.

Overexposure versus an acute chemical burn

Overexposure is dose over time: repeated wetting with shampoo surfactants, daily unprotected handling of developers, inhaling nail-liquid vapors in a room that does not meet OAC 175:10-7-3 ventilation, or leaving a sensitizing monomer on skin across many appointments. Outcomes include contact dermatitis, allergic sensitization (a later reaction that can be worse than the first), chronic nail-bed irritation, and respiratory complaints. The fix is engineering and work practice: ventilation that actually clears fumes, gloves from SDS Section 8, no fingers in jars, labeled closed containers, and not using the product more often or more concentrated than the label allows.

An acute chemical burn is immediate tissue injury from a corrosive or strongly irritating chemical—classic examples are hydroxide relaxer on the scalp or ears, high-volume peroxide left on a compromised scalp, acid or hypochlorite concentrate splashed in an eye, or a perm or relaxer that was not fully rinsed. The tissue may sting, blanch, blister, or keep “cooking” until the chemical is removed and diluted. Overexposure can eventually include chemical burns, but exam items usually contrast slow, repeated harm with right-now caustic harm.

First aid: SDS Section 4, not a folk “neutralizer”

Oklahoma’s sanitation chapter tells you how to store and mix chemicals and how to glove over a cut. It does not hand you a unique OSBCB chemical-burn flowchart. Inventing a Board-required “apply opposite-pH toner for exactly ten minutes” is how people make burns worse. The professional sequence, which you then check against that product’s SDS Section 4, is:

1. Stop the service immediately. Get the chemical off the client or off yourself. Call for help if the person cannot stand or see.
2. Remove contaminated capes, cotton, and gloves so soaked fabric does not keep feeding the reaction.
3. Rinse the affected skin or eyes with copious cool running water. Eye splashes generally need a long, continuous flush; follow the SDS time, which is often on the order of 15–20 minutes for corrosive exposures. Do not delay rinsing to hunt for a magic cream.
4. Do not neutralize a burn with a kitchen acid or alkali unless that SDS expressly says to. Dumping vinegar on a hydroxide scalp burn or baking soda on an acid splash can release heat (another reaction) and deepen injury.
5. Read SDS Section 4 for special notes (for example, hydrofluoric acid is not a salon staple, but the habit of checking the sheet still matters for unusual nail chemicals).
6. Medical referral for anything more than a trivial, immediately comforted irritation: eye involvement, blistering, large area, child client, respiratory distress from fumes, or pain that continues after rinsing.
7. Document what product, what mix ratio, what contact time, and what first aid you performed. Product-knowledge liability under 175:10-7-28 is why that record matters.
8. Do not finish the chemical service on injured tissue. A “quick rinse and keep going” is how a first-degree injury becomes a career-ending complaint.

If the emergency was inhalation of chloramine or chlorine from a hypochlorite mixing mistake, get people to fresh air, keep the area evacuated, and treat it as a medical / fire-department event, not a styling problem. SDS Section 6 covers spill response; you are not a HAZMAT team, but you are the person who should have never created that mixture (175:10-7-3(g)).

Gloves, nicks, and what is not a chemical-burn kit

OAC 175:10-7-18 is the published Oklahoma skin-integrity rule. Wash hands with running water and soap, dry with a disposable towel, before services and after eating, smoking, or restroom use; antibacterial soap is not recommended. Examine skin before and after the service. If you have an abrasion, cut, scratch, open lesion, or infection, wear protective or disposable gloves so you do not become a two-way pipe for microbes or salon chemicals. Styptic pencils and lump alum are prohibited. For ordinary bleeding nicks, use liquid or powdered astringent on separate, clean, sterile gauze or cotton, then dispose of it. That nick protocol is not chemical-burn treatment. Do not pack a hydroxide burn with styptic and call it first aid.

Prevent the emergency with the same chemistry you already learned

Most “reaction” items are failed prevention:

• Strand test and timing so an exothermic relaxer is not a guess.
• Base and protect ears, nape, and scalp per the relaxer label—not as folklore, as labeled preparation under 175:10-7-28.
• Ventilation that actually rids the room of nail-product and bleach fumes (175:10-7-3(a)).
• Original containers and named secondary bottles so nobody grabs the wrong liquid during a rush.
• EPA wet sanitizer mixed as labeled so you are not tempted to “boost” it with acid or ammonia.
• PPE from SDS Section 8 before the splash, not after.

Overexposure control is boring on purpose: open the exhaust, cover the pan, glove the cut, mix one chemistry at a time. Chemical-burn control is fast on purpose: stop, rinse, SDS, medical care. If you keep those two speeds straight, you have the reaction chapter.

A workable exam story: hydroxide cream creeps onto a dry scalp and the client reports burning now—that is an acute burn path (stop, rinse, SDS, medical help). A nail technician with chronic cough in a windowless acrylic room is overexposure (ventilation, SDS Section 8, perhaps a different product). A licensee with a paper-cut who keeps dipping unprotected fingers into developer is both a 175:10-7-18 glove problem and an overexposure problem. None of those stories require a fictional Oklahoma Board “burn ointment.” They require the SDS you should already be able to find and the sanitation rules you should already be mixing to.